feat(trader): wire Hyperliquid wallet and quick trade flow

- Add wallet API endpoints and exchange storage fields for Hyperliquid

- Normalize quick trade order paths, symbols, and builder fee coverage

- Add frontend wallet connect and quick trade helpers

trader/hyperliquid/builder_fee_test.go

@@ -0,0 +1,15 @@
+package hyperliquid
+
+import "testing"
+
+func TestDefaultBuilderIsHardcodedToApprovedFeeTier(t *testing.T) {
+	if defaultBuilder == nil {
+		t.Fatal("defaultBuilder is nil")
+	}
+	if got := defaultBuilder.Builder; got != "0x891dc6f05ad47a3c1a05da55e7a7517971faaf0d" {
+		t.Fatalf("defaultBuilder.Builder = %s, want hardcoded NOFX builder", got)
+	}
+	if got := defaultBuilder.Fee; got != 100 {
+		t.Fatalf("defaultBuilder.Fee = %d, want hardcoded 100 for 0.1%%", got)
+	}
+}